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Economic aspects of introducing Trichogramma evanescens Westw. against Asian corn borer Ostrinia furnacalis Guenee in the Philippines / by Reinhold Kugel.
- Vauk,
- 1994.
- Kiel :
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The marketing system for sorghum and other major crops in the Sudan : a spatial and temporal equilibrium analysis / by Abdelaziz Abdelfattah Hashim.
- Vauk,
- 1994.
- Kiel :